1 | /* |
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2 | * rxhandlers.c |
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3 | * |
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4 | * This file contains most all of the incoming packet handlers, along |
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5 | * with aim_rxdispatch(), the Rx dispatcher. Queue/list management is |
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6 | * actually done in aim_rxqueue.c. |
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7 | * |
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8 | */ |
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9 | |
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10 | #define FAIM_INTERNAL |
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11 | #include <aim.h> |
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12 | |
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13 | struct aim_rxcblist_s { |
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14 | fu16_t family; |
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15 | fu16_t type; |
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16 | aim_rxcallback_t handler; |
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17 | fu16_t flags; |
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18 | struct aim_rxcblist_s *next; |
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19 | }; |
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20 | |
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21 | faim_internal aim_module_t *aim__findmodulebygroup(aim_session_t *sess, fu16_t group) |
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22 | { |
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23 | aim_module_t *cur; |
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24 | |
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25 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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26 | if (cur->family == group) |
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27 | return cur; |
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28 | } |
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29 | |
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30 | return NULL; |
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31 | } |
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32 | |
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33 | faim_internal aim_module_t *aim__findmodule(aim_session_t *sess, const char *name) |
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34 | { |
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35 | aim_module_t *cur; |
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36 | |
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37 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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38 | if (strcmp(name, cur->name) == 0) |
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39 | return cur; |
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40 | } |
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41 | |
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42 | return NULL; |
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43 | } |
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44 | |
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45 | faim_internal int aim__registermodule(aim_session_t *sess, int (*modfirst)(aim_session_t *, aim_module_t *)) |
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46 | { |
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47 | aim_module_t *mod; |
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48 | |
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49 | if (!sess || !modfirst) |
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50 | return -1; |
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51 | |
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52 | if (!(mod = malloc(sizeof(aim_module_t)))) |
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53 | return -1; |
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54 | memset(mod, 0, sizeof(aim_module_t)); |
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55 | |
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56 | if (modfirst(sess, mod) == -1) { |
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57 | free(mod); |
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58 | return -1; |
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59 | } |
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60 | |
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61 | if (aim__findmodule(sess, mod->name)) { |
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62 | if (mod->shutdown) |
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63 | mod->shutdown(sess, mod); |
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64 | free(mod); |
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65 | return -1; |
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66 | } |
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67 | |
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68 | mod->next = (aim_module_t *)sess->modlistv; |
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69 | (aim_module_t *)sess->modlistv = mod; |
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70 | |
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71 | faimdprintf(sess, 1, "registered module %s (family 0x%04x, version = 0x%04x, tool 0x%04x, tool version 0x%04x)\n", mod->name, mod->family, mod->version, mod->toolid, mod->toolversion); |
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72 | |
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73 | return 0; |
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74 | } |
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75 | |
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76 | faim_internal void aim__shutdownmodules(aim_session_t *sess) |
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77 | { |
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78 | aim_module_t *cur; |
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79 | |
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80 | for (cur = (aim_module_t *)sess->modlistv; cur; ) { |
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81 | aim_module_t *tmp; |
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82 | |
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83 | tmp = cur->next; |
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84 | |
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85 | if (cur->shutdown) |
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86 | cur->shutdown(sess, cur); |
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87 | |
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88 | free(cur); |
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89 | |
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90 | cur = tmp; |
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91 | } |
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92 | |
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93 | sess->modlistv = NULL; |
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94 | |
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95 | return; |
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96 | } |
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97 | |
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98 | static int consumesnac(aim_session_t *sess, aim_frame_t *rx) |
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99 | { |
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100 | aim_module_t *cur; |
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101 | aim_modsnac_t snac; |
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102 | |
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103 | if (aim_bstream_empty(&rx->data) < 10) |
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104 | return 0; |
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105 | |
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106 | snac.family = aimbs_get16(&rx->data); |
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107 | snac.subtype = aimbs_get16(&rx->data); |
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108 | snac.flags = aimbs_get16(&rx->data); |
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109 | snac.id = aimbs_get32(&rx->data); |
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110 | |
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111 | /* SNAC flags are apparently uniform across all SNACs, so we handle them here */ |
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112 | if (snac.flags & 0x0001) { |
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113 | /* |
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114 | * This means the SNAC will be followed by another SNAC with |
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115 | * related information. We don't need to do anything about |
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116 | * this here. |
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117 | */ |
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118 | } |
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119 | if (snac.flags & 0x8000) { |
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120 | /* |
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121 | * This packet contains the version of the family that this SNAC is |
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122 | * in. You get this when your SSI module is version 2 or higher. |
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123 | * For now we have no need for this, but you could always save |
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124 | * it as a part of aim_modnsac_t, or something. The format is... |
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125 | * 2 byte length of total mini-header (which is 6 bytes), then TLV |
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126 | * of type 0x0001, length 0x0002, value is the 2 byte version |
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127 | * number |
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128 | */ |
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129 | aim_bstream_advance(&rx->data, aimbs_get16(&rx->data)); |
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130 | } |
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131 | |
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132 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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133 | |
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134 | if (!(cur->flags & AIM_MODFLAG_MULTIFAMILY) && |
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135 | (cur->family != snac.family)) |
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136 | continue; |
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137 | |
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138 | if (cur->snachandler(sess, cur, rx, &snac, &rx->data)) |
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139 | return 1; |
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140 | |
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141 | } |
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142 | |
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143 | return 0; |
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144 | } |
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145 | |
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146 | static int consumenonsnac(aim_session_t *sess, aim_frame_t *rx, fu16_t family, fu16_t subtype) |
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147 | { |
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148 | aim_module_t *cur; |
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149 | aim_modsnac_t snac; |
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150 | |
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151 | snac.family = family; |
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152 | snac.subtype = subtype; |
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153 | snac.flags = snac.id = 0; |
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154 | |
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155 | for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) { |
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156 | |
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157 | if (!(cur->flags & AIM_MODFLAG_MULTIFAMILY) && |
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158 | (cur->family != snac.family)) |
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159 | continue; |
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160 | |
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161 | if (cur->snachandler(sess, cur, rx, &snac, &rx->data)) |
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162 | return 1; |
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163 | |
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164 | } |
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165 | |
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166 | return 0; |
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167 | } |
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168 | |
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169 | static int negchan_middle(aim_session_t *sess, aim_frame_t *fr) |
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170 | { |
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171 | aim_tlvlist_t *tlvlist; |
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172 | char *msg = NULL; |
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173 | fu16_t code = 0; |
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174 | aim_rxcallback_t userfunc; |
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175 | int ret = 1; |
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176 | |
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177 | if (aim_bstream_empty(&fr->data) == 0) { |
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178 | /* XXX should do something with this */ |
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179 | return 1; |
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180 | } |
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181 | |
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182 | /* Used only by the older login protocol */ |
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183 | /* XXX remove this special case? */ |
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184 | if (fr->conn->type == AIM_CONN_TYPE_AUTH) |
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185 | return consumenonsnac(sess, fr, 0x0017, 0x0003); |
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186 | |
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187 | tlvlist = aim_readtlvchain(&fr->data); |
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188 | |
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189 | if (aim_gettlv(tlvlist, 0x0009, 1)) |
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190 | code = aim_gettlv16(tlvlist, 0x0009, 1); |
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191 | |
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192 | if (aim_gettlv(tlvlist, 0x000b, 1)) |
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193 | msg = aim_gettlv_str(tlvlist, 0x000b, 1); |
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194 | |
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195 | if ((userfunc = aim_callhandler(sess, fr->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_CONNERR))) |
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196 | ret = userfunc(sess, fr, code, msg); |
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197 | |
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198 | aim_freetlvchain(&tlvlist); |
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199 | |
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200 | free(msg); |
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201 | |
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202 | return ret; |
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203 | } |
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204 | |
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205 | /* |
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206 | * Bleck functions get called when there's no non-bleck functions |
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207 | * around to cleanup the mess... |
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208 | */ |
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209 | faim_internal int bleck(aim_session_t *sess, aim_frame_t *frame, ...) |
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210 | { |
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211 | fu16_t family, subtype; |
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212 | fu16_t maxf, maxs; |
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213 | |
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214 | static const char *channels[6] = { |
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215 | "Invalid (0)", |
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216 | "FLAP Version", |
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217 | "SNAC", |
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218 | "Invalid (3)", |
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219 | "Negotiation", |
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220 | "FLAP NOP" |
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221 | }; |
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222 | static const int maxchannels = 5; |
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223 | |
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224 | /* XXX: this is ugly. and big just for debugging. */ |
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225 | static const char *literals[14][25] = { |
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226 | {"Invalid", |
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227 | NULL |
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228 | }, |
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229 | {"General", |
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230 | "Invalid", |
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231 | "Error", |
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232 | "Client Ready", |
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233 | "Server Ready", |
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234 | "Service Request", |
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235 | "Redirect", |
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236 | "Rate Information Request", |
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237 | "Rate Information", |
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238 | "Rate Information Ack", |
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239 | NULL, |
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240 | "Rate Information Change", |
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241 | "Server Pause", |
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242 | NULL, |
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243 | "Server Resume", |
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244 | "Request Personal User Information", |
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245 | "Personal User Information", |
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246 | "Evil Notification", |
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247 | NULL, |
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248 | "Migration notice", |
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249 | "Message of the Day", |
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250 | "Set Privacy Flags", |
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251 | "Well Known URL", |
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252 | "NOP" |
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253 | }, |
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254 | {"Location", |
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255 | "Invalid", |
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256 | "Error", |
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257 | "Request Rights", |
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258 | "Rights Information", |
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259 | "Set user information", |
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260 | "Request User Information", |
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261 | "User Information", |
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262 | "Watcher Sub Request", |
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263 | "Watcher Notification" |
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264 | }, |
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265 | {"Buddy List Management", |
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266 | "Invalid", |
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267 | "Error", |
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268 | "Request Rights", |
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269 | "Rights Information", |
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270 | "Add Buddy", |
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271 | "Remove Buddy", |
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272 | "Watcher List Query", |
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273 | "Watcher List Response", |
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274 | "Watcher SubRequest", |
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275 | "Watcher Notification", |
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276 | "Reject Notification", |
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277 | "Oncoming Buddy", |
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278 | "Offgoing Buddy" |
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279 | }, |
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280 | {"Messeging", |
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281 | "Invalid", |
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282 | "Error", |
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283 | "Add ICBM Parameter", |
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284 | "Remove ICBM Parameter", |
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285 | "Request Parameter Information", |
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286 | "Parameter Information", |
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287 | "Outgoing Message", |
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288 | "Incoming Message", |
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289 | "Evil Request", |
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290 | "Evil Reply", |
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291 | "Missed Calls", |
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292 | "Message Error", |
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293 | "Host Ack" |
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294 | }, |
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295 | {"Advertisements", |
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296 | "Invalid", |
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297 | "Error", |
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298 | "Request Ad", |
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299 | "Ad Data (GIFs)" |
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300 | }, |
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301 | {"Invitation / Client-to-Client", |
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302 | "Invalid", |
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303 | "Error", |
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304 | "Invite a Friend", |
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305 | "Invitation Ack" |
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306 | }, |
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307 | {"Administrative", |
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308 | "Invalid", |
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309 | "Error", |
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310 | "Information Request", |
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311 | "Information Reply", |
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312 | "Information Change Request", |
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313 | "Information Chat Reply", |
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314 | "Account Confirm Request", |
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315 | "Account Confirm Reply", |
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316 | "Account Delete Request", |
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317 | "Account Delete Reply" |
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318 | }, |
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319 | {"Popups", |
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320 | "Invalid", |
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321 | "Error", |
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322 | "Display Popup" |
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323 | }, |
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324 | {"BOS", |
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325 | "Invalid", |
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326 | "Error", |
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327 | "Request Rights", |
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328 | "Rights Response", |
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329 | "Set group permission mask", |
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330 | "Add permission list entries", |
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331 | "Delete permission list entries", |
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332 | "Add deny list entries", |
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333 | "Delete deny list entries", |
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334 | "Server Error" |
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335 | }, |
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336 | {"User Lookup", |
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337 | "Invalid", |
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338 | "Error", |
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339 | "Search Request", |
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340 | "Search Response" |
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341 | }, |
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342 | {"Stats", |
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343 | "Invalid", |
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344 | "Error", |
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345 | "Set minimum report interval", |
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346 | "Report Events" |
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347 | }, |
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348 | {"Translate", |
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349 | "Invalid", |
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350 | "Error", |
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351 | "Translate Request", |
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352 | "Translate Reply", |
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353 | }, |
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354 | {"Chat Navigation", |
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355 | "Invalid", |
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356 | "Error", |
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357 | "Request rights", |
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358 | "Request Exchange Information", |
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359 | "Request Room Information", |
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360 | "Request Occupant List", |
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361 | "Search for Room", |
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362 | "Outgoing Message", |
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363 | "Incoming Message", |
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364 | "Evil Request", |
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365 | "Evil Reply", |
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366 | "Chat Error", |
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367 | } |
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368 | }; |
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369 | |
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370 | maxf = sizeof(literals) / sizeof(literals[0]); |
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371 | maxs = sizeof(literals[0]) / sizeof(literals[0][0]); |
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372 | |
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373 | if (frame->hdr.flap.type == 0x02) { |
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374 | |
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375 | family = aimbs_get16(&frame->data); |
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376 | subtype = aimbs_get16(&frame->data); |
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377 | |
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378 | if ((family < maxf) && (subtype+1 < maxs) && (literals[family][subtype] != NULL)) |
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379 | faimdprintf(sess, 0, "bleck: channel %s: null handler for %04x/%04x (%s)\n", channels[frame->hdr.flap.type], family, subtype, literals[family][subtype+1]); |
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380 | else |
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381 | faimdprintf(sess, 0, "bleck: channel %s: null handler for %04x/%04x (no literal)\n", channels[frame->hdr.flap.type], family, subtype); |
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382 | } else { |
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383 | |
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384 | if (frame->hdr.flap.type <= maxchannels) |
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385 | faimdprintf(sess, 0, "bleck: channel %s (0x%02x)\n", channels[frame->hdr.flap.type], frame->hdr.flap.type); |
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386 | else |
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387 | faimdprintf(sess, 0, "bleck: unknown channel 0x%02x\n", frame->hdr.flap.type); |
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388 | |
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389 | } |
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390 | |
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391 | return 1; |
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392 | } |
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393 | |
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394 | faim_export int aim_conn_addhandler(aim_session_t *sess, aim_conn_t *conn, fu16_t family, fu16_t type, aim_rxcallback_t newhandler, fu16_t flags) |
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395 | { |
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396 | struct aim_rxcblist_s *newcb; |
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397 | |
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398 | if (!conn) |
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399 | return -1; |
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400 | |
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401 | faimdprintf(sess, 1, "aim_conn_addhandler: adding for %04x/%04x\n", family, type); |
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402 | |
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403 | if (!(newcb = (struct aim_rxcblist_s *)calloc(1, sizeof(struct aim_rxcblist_s)))) |
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404 | return -1; |
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405 | |
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406 | newcb->family = family; |
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407 | newcb->type = type; |
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408 | newcb->flags = flags; |
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409 | newcb->handler = newhandler ? newhandler : bleck; |
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410 | newcb->next = NULL; |
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411 | |
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412 | if (!conn->handlerlist) |
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413 | conn->handlerlist = (void *)newcb; |
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414 | else { |
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415 | struct aim_rxcblist_s *cur; |
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416 | |
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417 | for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur->next; cur = cur->next) |
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418 | ; |
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419 | cur->next = newcb; |
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420 | } |
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421 | |
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422 | return 0; |
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423 | } |
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424 | |
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425 | faim_export int aim_clearhandlers(aim_conn_t *conn) |
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426 | { |
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427 | struct aim_rxcblist_s *cur; |
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428 | |
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429 | if (!conn) |
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430 | return -1; |
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431 | |
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432 | for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur; ) { |
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433 | struct aim_rxcblist_s *tmp; |
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434 | |
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435 | tmp = cur->next; |
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436 | free(cur); |
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437 | cur = tmp; |
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438 | } |
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439 | conn->handlerlist = NULL; |
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440 | |
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441 | return 0; |
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442 | } |
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443 | |
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444 | faim_internal aim_rxcallback_t aim_callhandler(aim_session_t *sess, aim_conn_t *conn, fu16_t family, fu16_t type) |
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445 | { |
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446 | struct aim_rxcblist_s *cur; |
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447 | |
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448 | if (!conn) |
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449 | return NULL; |
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450 | |
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451 | faimdprintf(sess, 1, "aim_callhandler: calling for %04x/%04x\n", family, type); |
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452 | |
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453 | for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur; cur = cur->next) { |
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454 | if ((cur->family == family) && (cur->type == type)) |
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455 | return cur->handler; |
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456 | } |
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457 | |
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458 | if (type == AIM_CB_SPECIAL_DEFAULT) { |
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459 | faimdprintf(sess, 1, "aim_callhandler: no default handler for family 0x%04x\n", family); |
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460 | return NULL; /* prevent infinite recursion */ |
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461 | } |
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462 | |
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463 | faimdprintf(sess, 1, "aim_callhandler: no handler for 0x%04x/0x%04x\n", family, type); |
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464 | |
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465 | return aim_callhandler(sess, conn, family, AIM_CB_SPECIAL_DEFAULT); |
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466 | } |
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467 | |
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468 | faim_internal void aim_clonehandlers(aim_session_t *sess, aim_conn_t *dest, aim_conn_t *src) |
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469 | { |
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470 | struct aim_rxcblist_s *cur; |
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471 | |
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472 | for (cur = (struct aim_rxcblist_s *)src->handlerlist; cur; cur = cur->next) { |
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473 | aim_conn_addhandler(sess, dest, cur->family, cur->type, |
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474 | cur->handler, cur->flags); |
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475 | } |
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476 | |
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477 | return; |
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478 | } |
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479 | |
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480 | faim_internal int aim_callhandler_noparam(aim_session_t *sess, aim_conn_t *conn,fu16_t family, fu16_t type, aim_frame_t *ptr) |
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481 | { |
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482 | aim_rxcallback_t userfunc; |
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483 | |
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484 | if ((userfunc = aim_callhandler(sess, conn, family, type))) |
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485 | return userfunc(sess, ptr); |
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486 | |
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487 | return 1; /* XXX */ |
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488 | } |
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489 | |
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490 | /* |
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491 | * aim_rxdispatch() |
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492 | * |
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493 | * Basically, heres what this should do: |
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494 | * 1) Determine correct packet handler for this packet |
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495 | * 2) Mark the packet handled (so it can be dequeued in purge_queue()) |
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496 | * 3) Send the packet to the packet handler |
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497 | * 4) Go to next packet in the queue and start over |
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498 | * 5) When done, run purge_queue() to purge handled commands |
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499 | * |
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500 | * TODO: Clean up. |
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501 | * TODO: More support for mid-level handlers. |
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502 | * TODO: Allow for NULL handlers. |
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503 | * |
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504 | */ |
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505 | faim_export void aim_rxdispatch(aim_session_t *sess) |
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506 | { |
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507 | int i; |
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508 | aim_frame_t *cur; |
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509 | |
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510 | for (cur = sess->queue_incoming, i = 0; cur; cur = cur->next, i++) { |
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511 | |
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512 | /* |
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513 | * XXX: This is still fairly ugly. |
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514 | */ |
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515 | |
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516 | if (cur->handled) |
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517 | continue; |
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518 | |
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519 | if (cur->hdrtype == AIM_FRAMETYPE_FLAP) { |
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520 | if (cur->hdr.flap.type == 0x01) { |
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521 | cur->handled = aim_callhandler_noparam(sess, cur->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_FLAPVER, cur); /* XXX use consumenonsnac */ |
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522 | continue; |
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523 | |
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524 | } else if (cur->hdr.flap.type == 0x02) { |
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525 | if ((cur->handled = consumesnac(sess, cur))) |
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526 | continue; |
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527 | |
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528 | } else if (cur->hdr.flap.type == 0x04) { |
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529 | cur->handled = negchan_middle(sess, cur); |
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530 | continue; |
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531 | |
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532 | } else if (cur->hdr.flap.type == 0x05) { |
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533 | |
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534 | } |
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535 | |
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536 | } else if (cur->hdrtype == AIM_FRAMETYPE_OFT) { |
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537 | if (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS) { |
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538 | aim_rxdispatch_rendezvous(sess, cur); |
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539 | cur->handled = 1; |
---|
540 | continue; |
---|
541 | |
---|
542 | } else if (cur->conn->type == AIM_CONN_TYPE_LISTENER) { |
---|
543 | /* not possible */ |
---|
544 | faimdprintf(sess, 0, "rxdispatch called on LISTENER connection!\n"); |
---|
545 | cur->handled = 1; |
---|
546 | continue; |
---|
547 | } |
---|
548 | } |
---|
549 | |
---|
550 | if (!cur->handled) { |
---|
551 | consumenonsnac(sess, cur, 0xffff, 0xffff); /* last chance! */ |
---|
552 | cur->handled = 1; |
---|
553 | } |
---|
554 | } |
---|
555 | |
---|
556 | /* |
---|
557 | * This doesn't have to be called here. It could easily be done |
---|
558 | * by a seperate thread or something. It's an administrative operation, |
---|
559 | * and can take a while. Though the less you call it the less memory |
---|
560 | * you'll have :) |
---|
561 | */ |
---|
562 | aim_purge_rxqueue(sess); |
---|
563 | |
---|
564 | return; |
---|
565 | } |
---|
566 | |
---|
567 | faim_internal int aim_parse_unknown(aim_session_t *sess, aim_frame_t *frame, ...) |
---|
568 | { |
---|
569 | int i; |
---|
570 | |
---|
571 | faimdprintf(sess, 1, "\nRecieved unknown packet:"); |
---|
572 | |
---|
573 | for (i = 0; aim_bstream_empty(&frame->data); i++) { |
---|
574 | if ((i % 8) == 0) |
---|
575 | faimdprintf(sess, 1, "\n\t"); |
---|
576 | |
---|
577 | faimdprintf(sess, 1, "0x%2x ", aimbs_get8(&frame->data)); |
---|
578 | } |
---|
579 | |
---|
580 | faimdprintf(sess, 1, "\n\n"); |
---|
581 | |
---|
582 | return 1; |
---|
583 | } |
---|